1config EXT3_FS
2 tristate "Ext3 journalling file system support"
3 select JBD
4 help
5 This is the journalling version of the Second extended file system
6 (often called ext3), the de facto standard Linux file system
7 (method to organize files on a storage device) for hard disks.
8 9 The journalling code included in this driver means you do not have
10 to run e2fsck (file system checker) on your file systems after a
11 crash. The journal keeps track of any changes that were being made
12 at the time the system crashed, and can ensure that your file system
13 is consistent without the need for a lengthy check.
14 15 Other than adding the journal to the file system, the on-disk format
16 of ext3 is identical to ext2. It is possible to freely switch
17 between using the ext3 driver and the ext2 driver, as long as the
18 file system has been cleanly unmounted, or e2fsck is run on the file
19 system.
20 21 To add a journal on an existing ext2 file system or change the
22 behavior of ext3 file systems, you can use the tune2fs utility ("man
23 tune2fs"). To modify attributes of files and directories on ext3
24 file systems, use chattr ("man chattr"). You need to be using
25 e2fsprogs version 1.20 or later in order to create ext3 journals
26 (available at <http://sourceforge.net/projects/e2fsprogs/>).
27 28 To compile this file system support as a module, choose M here: the
29 module will be called ext3.
30 31config EXT3_DEFAULTS_TO_ORDERED
32 bool "Default to 'data=ordered' in ext3"
33 depends on EXT3_FS
34 default y
35 help
36 The journal mode options for ext3 have different tradeoffs
37 between when data is guaranteed to be on disk and
38 performance. The use of "data=writeback" can cause
39 unwritten data to appear in files after an system crash or
40 power failure, which can be a security issue. However,
41 "data=ordered" mode can also result in major performance
42 problems, including seconds-long delays before an fsync()
43 call returns. For details, see:
44 45http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs 46 47 If you have been historically happy with ext3's performance,
48 data=ordered mode will be a safe choice and you should
49 answer 'y' here. If you understand the reliability and data
50 privacy issues of data=writeback and are willing to make
51 that trade off, answer 'n'.
52 53config EXT3_FS_XATTR
54 bool "Ext3 extended attributes"
55 depends on EXT3_FS
56 default y
57 help
58 Extended attributes are name:value pairs associated with inodes by
59 the kernel or by users (see the attr(5) manual page, or visit
60 <http://acl.bestbits.at/> for details).
61 62 If unsure, say N.
63 64 You need this for POSIX ACL support on ext3.
65 66config EXT3_FS_POSIX_ACL
67 bool "Ext3 POSIX Access Control Lists"
68 depends on EXT3_FS_XATTR
69 select FS_POSIX_ACL
70 help
71 Posix Access Control Lists (ACLs) support permissions for users and
72 groups beyond the owner/group/world scheme.
73 74 To learn more about Access Control Lists, visit the Posix ACLs for
75 Linux website <http://acl.bestbits.at/>.
76 77 If you don't know what Access Control Lists are, say N
78 79config EXT3_FS_SECURITY
80 bool "Ext3 Security Labels"
81 depends on EXT3_FS_XATTR
82 help
83 Security labels support alternative access control models
84 implemented by security modules like SELinux. This option
85 enables an extended attribute handler for file security
86 labels in the ext3 filesystem.
87 88 If you are not using a security module that requires using
89 extended attributes for file security labels, say N.
90